Framework structure for a hydraulic press

ABSTRACT

A framework, for a hydraulic press, comprising closed parallel frames receiving loads through cross bars of the press. The frames include longitudinally and laterally extending members, the crossbars bearing on the latter by means of partly cylindrical projections which mate with complementary recesses in the laterally extending members. Cooperating centering parts are provided as are wedges which are inserted between the crossbars and frame.

United States Patent Efimov et a].

[151 3,678,728 [4 1 July 25,1972

[54] FRAMEWORK STRUCTURE FOR A HYDRAULIC PRESS [72] inventors: Leonid Alexandrovieh Eflmov, ul. Kh-

meleva, l8, kv. 77; Lev Mikhallovlch Shtin, prospekt Ordzhonikidze, 3, kv. 49; Vladimir Mikhailovich Sinitsky, ul. 40 let Oktyabrya, 9, kv. 39; Sergei Grigorlevich Khirdzhiev, ul. Mashinostroitelei, 5i, kv. 38; Petr Alexeevich Pylaikin, ul. Kirovogradskaya, 79, kv. 29; Ljudmila Sergeevna Satovskaya, prospekt Ordzhonikidze, 3, kv. 77; Nikolai Feodosovich Grebnev, ul. Kirovogradskaya, 63, kv. l8; Mikhail Grigorievich Russeikin, ul. Lomonosova, l9, kv. 7; Konstantin Yakovlevich Kalugin, ul. Uralskikh rabochikh, 69, kv. 2; Boris Stepanovich Somov, u]. Krasnykh partizan, 3, kv. 22, all of Sverdlovsk; Valdimir Mikhailovich Baranchikov, ul. Oktyabrskaya, l2, kv. 48, Kamensk Uralsky, Sverdlovskaya abl., all of U.S.S.R.

[22] Filed: Sept. 12, 1969 211 App]. No.2 857,361

52 U.S. c1 ..72/455 [58] Field or Search ..72/455, 453, 456; 100/214, 100/269 [56] Reierences Cited umren STATES PATENTS 2,875,652 3/1959 Ehlert ..100/214 3,024,676 3/l962 Howahr ....72/456 3,243,988 4/1966 GIOOS ...72/4ss 3,302,445 2/1967 Muller ..72/455 Primary Examiner-Charles W. Lanham Assistant ExaminerGene P. Crosby Attorney-Waters, Roditi, Schwartz & Nissen 57 ABSTRACT A framework, for a hydraulic press, comprising closed parallel frames receiving loads through cross bars of the press. The frames include longitudinally and laterally extending members, the crossbars bearing on the latter by means of partly cylindrical projections which mate: with complementary recesses in the laterally extending members. Cooperating centering parts are provided as are wedges which are inserted between the crossbars and frame.

6 Claims, 3 Drawing Figures Patented July 25, 1972 2 Sheets-Sheet 1 Patented July 25, 1972 3,678,728

2 Sheets-Sheet 2 FRAMEWORK STRUCTURE FOR A HYDRAULIC PRESS The present invention relates to improvements in hydraulic' presses, particularly horizontal hydraulic presses such as those used for metal extrusion operations, and, more specifically, the present invention'relates to supporting framework struc ture for such presses.

It is known that in these presses the working loads of the pressing operation are taken up by the framework of the press through the front and the rear crossbars thereof.

In the majority of horizontal presses of the prior art the working loads of the pressing operation are received by four longitudinal columns with threaded end portions, these columns acting similar to tying bolts in smaller structures. These columns hold together the rear, power cylinder-supporting crossbar of the press and the front crossbar, constituting together with these crossbars the framework of the press.

The threaded connections in the framework structures including such columns are subjected to considerable strain. Moreover, the mechanical strength of these columns is comparatively small, mainly, on account of the columns being manufactured by a free forging operation, while it is commonly known that the strength of forged metal parts is usually less than that of rolled stock. Besides, manufacturing of columns by forging is less economical than manufacturing of similar parts from rolled stock.

With the abovesaid in view, attempts have been made to use in horizontal presses a framework structure including two frames extending parallel to each other, the frames being manufactured from rolled stock either in the form of several sheet-metal parts stacked together or, alternatively, the frames were made separable along a longitudinal plane thereof and secured at the ends by ties disposed adjacent to the external sides of the lateral members of such frames.

However, it has been found that the frames in the form of sheet-metal parts stacked together were characterized by reduced lateral rigidity, whereas the manufacture of the frames separable along a longitudinal plane proved to be too labor consuming, owing to the necessity of finishing the end portions of the frames (the separation surfaces) to a very high accuracy.

Attempts have been also made to create horizontal presses having their framework made of unseparable, solid frames (see, for example, British Pat. No. 1,030,646) in which the crossbars were bearing upon the lateral members of the frames from the internal side thereof, the bearing surface being a planar one. In frameworks of this last-mentioned type the lateral members of the frame were connected to the longitudinal members thereof along curvilinear transition portions, while the bearing surface was spaced from the center lines of the longitudinal members, whereby the bending torque in the frame members was considerably increased. In order to make the frames withstand this increased bending torque, the size of the frames had to be increased, as well as Y the weight of the crossbars.

n the other hand, when the bearing surface .was brought nearer to the longitudinal members, it led to increased concentration of strain in the areas of the internal corners of the frames.

With all this is view, it is an object of the present invention to create a framework structure for a'horizontal press, including closed frames and crossbars bearing upon the lateral members of these frames from the internal side thereof, in which the bearing surfaces between the frames and the crossbars should be shaped and arranged so as to reduce the bending loads, acting upon the frames during pressing operation, to a positive minimum, whereby the weight of the crossbars of the press and that of the frames can be reduced.

The present invention resides in a framework for a hydraulic press, particularly, for a horizontal hydraulic press, comprising closed frames extending parallel to each other, said frames being adapted to receive the operating loads of the press through the crossbars thereof, the crossbars being disposed internally of said frames and bearing upon the lateral members of said frames from the internal side thereof. According to a characteristic feature of the present invention, the crossbars bear upon the lateral members of the frame through a pair of partly cylindrical projections carried by said crossbars, mating with complementary recesses provided in said lateral members, said recesses being disposed adjacent to the longitudinal members of said frames, the internal bearing surface of said recesses being continuous with the internal sur' face of the adjacent longitudinal members.

In this novel structure the transitional surfaces from the longitudinal members of the frames to the lateral members thereof are cylindrical ones, these cylindrical surfaces also acting as bearing surfaces receiving the forces from the crossbars of the press through partly cylindrical projections of a complementary shape, carried by the crossbars, which provides for the reduction of the concentration of strain in the transition areas and makes it possible to bring the bearing surfaces nearer to the longitudinal members of the frames. As a result, bending torque acting upon the members of the frames is reduced, and the construction of the crossbars of the press is improved, on account of the load transmitted by the crossbars being distributed in a most desirable manner (it is commonly known that in the cases of four load-bearing points the best solutionjs to arrange these points in the apices of an imaginary square), which, in turn, provides for the reduction of the weight of the crossbars.

In a preferred embodiment of the present invention, a centering groove is provided in each lateral member of said frames on the internal side thereof, said groove being disposed on the longitudinal center line of the respective frame and adapted to receive a projection carried by the respective crossbar.

The above-described connection of the frames with the crossbars with the help of projections mating with recesses situated in the compression areas of the lateral members, on the one hand, positively prevents any displacement of the longitudinal axes of the frames in relation to the longitudinal axis of the press under working loads, and, on the other hand, does not affect in any way the reliability and durability of the frames. Thus accuracy of the press operation is increased.

According to one of the features of the present invention, firm contact between the crossbars and the frames is insured by wedge blocks placed between the crossbars and the respec tive external sides of the frames, the wedge blocks being positioned opposite said mating partly cylindrical projections and complementary recesses, said wedge blocks establishing firm contact between said crossbars and said frames along said bearing surfaces.

The present invention will be better understood from the following detailed description of an embodiment thereof, due reference being had to the accompanying drawings, wherein:

FIG. 1 is a side view of a horizontal press having a framework constructed in accordance with the present invention;

FIG. 2 is a top view of the apparatus of FIG. 1;

FIG. 3 is an enlarged, partly sectional side view of the assembly connecting the frame with one of the crossbars.

Referring now to the drawings, the supporting guide beam 1 (FIGS. 1 and 2) has the following parts mounted thereon in succession: a front crossbar 2 adapted to support the stationary die (not shown in the drawings) of the press, a container 3 inside which work to be treated can be mounted, a movable crossbar 4 supporting a movable die 5, and a rear crossbar 6 supporting the power cylinder of the press. The rear crossbar 6 can also carry ties 7 supporting a piercing system 8 of the press, if the press in question incorporates such system.

The end most crossbars 2 and 6 have two closed frames 9 suspended therefrom, the two frames extending in parallel to each other and being mounted on the crossbars 2 and 6 by means of connections of the key-and-slo't type, each such connection including a groove 11 provided on the internal side of lateral members 12 of frames 9, the groove 11 being aligned with the longitudinal symmetry line of the respective frame 9;

the connection also including projections 13 on the respective crossbars 2 and 6, received in the corresponding ones of the grooves l l. j

The crossbars 2 and 6 bear upon the lateral members 12 of the frames 9 from the internal side thereof by means of two cylindrical, segment-shaped projections 14 mating with complementary recesses 15 provided in the lateral members 12. The recesses 15 are located adjacent to the respective longitudinal legs 16 of the frames 9, the internal surface of the recesses smoothly continuing that of the legs 16. Thus, each one of the crossbars 2 and 6 bears upon the frames 9 at four points disposed at the apices of an imaginary square.

The projections 14 can be either made integral with the respective crossbars 2 and 6, or, alternatively, can be separable from the latter. In the latter case they are attached to the crossbars 2 and 6 by bolts 17, as shown in FIG. 3. It is obvious that making the projections 14 separable from the crossbars is preferable, since in this way positioning thereof in the recesses 15 is appreciably facilitated.

intimate contact between the frames 9 and the crossbars 2 and 6 is achieved by placing wedge blocks 18 therebetween, the wedge blocks being positioned opposite the mating projections 14 and recesses 15 and finally assembled with the structure when the load applied to the frames reaches its maximum operation value, whereafter the wedge blocks 18 are retained in their respective positions.

Each one of the frames 9 is made as an integral part, allwelded from thick-sheet rolled stock. In operation the longitudinal legs 16 of the frames are subjected to tensional loads plus insignificant bending strain, whereas the lateral members 12 of the frames are subjected to bending loads only. The legs 16 are rectangular in cross section, with the width to thickness ratio chosen to insure sufficient lateral rigidity of the frame.

When the press is in operation, a compression area is developed inside the lateral members 12 adjacent to the internal side thereof, and a tension area is developed adjacent to the external side thereof. Consequently, the projections 13 of the crossbars 2 and 6 are always properly centered in relation to the recesses 11 of the lateral members 12 of the frames 9, and the center line of the frames 9 is always aligned with the longitudinal center line of the press.

It has been practically established that horizontal presses incorporating a framework structure embodying the present invention feature reduced weight and more accurate operation, as compared with similar presses of the prior art.

We claim:

1. Framework structure for a hydraulic press subjected to operating loads and having at least two crossbars, said framework comprising a plurality of closed frames extending in parallel to each other. said frames being adapted to receive the operating loads of said press through said crossbars which are disposed internally of said closed frames, said frames including intercoupled longitudinally and laterally extending members, a pair of partly cylindrical projections corresponding to each of said crossbars, each of said crossbars respectively bearing upon one of said laterally extending members from the internal side thereof through the corresponding pair of partly cylindrical projections, said projections mating with complementary recesses provided in said laterally extending members, said recesses being disposed adjacent to said longitudinally extending members of said frames, the internal bearing surface of said recesses being continuous with the internal surface of the adjacent ones of said longitudinally extending members of said frame.

2. Framework structure as claimed in claim 1, in which a centering groove is provided in each one of said laterally extending members of said frames on the internal side thereof, said groove being aligned with the longitudinal center line of the respective frame, said groove being adapted to receive thereinside a mating projection carried by a respective one of said crossbars.

I 3. Framework structure as claimed in claim 1, comprising wedge means between said crossbars and the respective external sides of said frames, said wedge means being positioned opposite said partly cylindrical projections and said complementary recesses, said wedge means being adapted to establish intimate contact between said crossbars and said frames along said bearing surfaces.

4. Framework structure as claimed in claim 1 wherein the cylindrical projections are integral with said crossbars.

5. Framework structure as claimed in claim 1 wherein the cylindrical projections are connected to said crossbars.

6. Framework structure as claimed in claim 1 wherein said frames are horizontally disposed. 

1. Framework structure for a hydraulic press subjected to operating loads and having at least two crossbars, said framework comprising a plurality of closed frames extending in parallel to each other, said frames being adapted to receive the operating loads of said press through said crossbars which are disposed internally of said closed frames, said frames including intercoupled longitudinally and laterally extending members, a pair of partly cylindrical projections corresponding to each of said crossbars, each of said crossbars respectively bearing upon one of said laterally extending members from the internal side thereof through the corresponding pair of partly cylindrical projections, said projections mating with complementary recesses provided in said laterally extending members, said recesses being disposed adjacent to said longitudinally extending members of said frames, the internal bearing surface of said recesses being continuous with the internal surface of the adjacent ones of said longitudinally extending members of said frame.
 2. Framework structure as claimed in claim 1, in which a centering groove is provided in each one of said laterally extending members of said frames on the internal side thereof, said groove being aligned with the longitudinal center line of the respective frame, said groove being adapted to receive thereinside a mating projection carried by a respective one of said crossbars.
 3. Framework structure as claimed in claim 1, comprising wedge means between said crossbars and the respective external sides of said frames, said wedge means being positioned opposite said partly cylindrical projections and said complementary recesses, said wedge means being adapted to establish intimate contact between said crossbars and said frames along said bearing surfaces.
 4. Framework structure as claimed in claim 1 wherein the cylindrical projections are integral with said crossbars.
 5. Framework structure as claimed in claim 1 wherein the cylindrical projections are connected to said crossbars.
 6. Framework structure as claimed in claim 1 wherein said frames are horizontally disposed. 